Battery pack

Abstract

Embodiments of the invention provide a battery pack including a pack body and a plurality of terminals. The pack body has first and second main surfaces that are opposed to each other in a first axis direction, first and second end surfaces that are opposed to each other in a second axis direction orthogonal to the first axis direction, and first and second side surfaces that are opposed to each other in a third axis direction orthogonal to the first axis direction and the second axis direction. The plurality of terminals includes a positive terminal, a negative terminal, a temperature detection terminal, and a control terminal that are arranged on the first end surface along the third axis direction. The negative terminal is arranged between the temperature detection terminal and the control terminal and closer to the control terminal than the temperature detection terminal.

The invention claimed is: 
     
       1. A battery pack, comprising:
 a pack body having a first main surface and a second main surface that are opposed to each other in a first axis direction, a first end surface and a second end surface that are opposed to each other in a second axis direction orthogonal to the first axis direction, and a first side surface and a second side surface that are opposed to each other in a third axis direction orthogonal to the first axis direction and the second axis direction; 
 a plurality of terminals including at least a positive terminal, a negative terminal, and a temperature terminal that are arranged on the first end surface along the third axis direction; and 
 a cover having a plurality of terminal windows placed on the first end surface, configured to expose the terminals to outside, 
 wherein the first end surface includes a first side region and a second side region opposed to each other in a width direction, each of the first side region and the second side region being formed by a part of a peripheral surface of having a cylindrical shape with a predetermined radius, 
 wherein for each of the first side region and the second side region, a circumference of a circle formed by the cylindrical shape overlaps with one of the plurality of terminals, 
 wherein the first end surface includes a first concave portion provided close to the first side surface and a second concave portion provided close to the second side surface, and 
 wherein the first concave portion has a width dimension larger than that of the second concave portion in the third axis direction. 
 
     
     
       2. The battery pack according to  claim 1 , wherein the plurality of terminal windows includes at least a first terminal window related to the positive terminal, a second terminal window related to the negative terminal, and a third terminal window related to the temperature terminal. 
     
     
       3. The battery pack according to  claim 2 , wherein the plurality of terminal windows are closer to the first main surface than the second main surface along the first axis. 
     
     
       4. The battery pack according to  claim 2 , wherein the circumference of the circle formed by the first side region overlaps with the first terminal window. 
     
     
       5. The battery pack according to  claim 1 , wherein the first concave portion is provided within the circumference of the circle formed by the first side region, and
 wherein the second concave portion is provided within the circumference of the circle formed by the second side region. 
 
     
     
       6. The battery pack according to  claim 1  wherein the first concave portion and the second concave portion are arranged closer to the second main surface than the first main surface. 
     
     
       7. The battery pack according to  claim 1  wherein the first concave portion and the second concave portion each have a height dimension of 1.8 mm or more along the second axis direction. 
     
     
       8. The battery pack according to  claim 1 , wherein the plurality of terminal windows comprises four terminal windows arranged on the first end surface along the third axis direction. 
     
     
       9. The battery pack according to  claim 8 , wherein the fourth terminal window is related to a control terminal. 
     
     
       10. The battery pack according to  claim 9 , wherein the circumference of the circle formed by the second side region overlaps with the fourth terminal window. 
     
     
       11. The battery pack according to  claim 1 , wherein the temperature terminal is located between the positive terminal and the negative terminal along the third axis direction. 
     
     
       12. A battery pack, comprising:
 a pack body having a first main surface and a second main surface that are opposed to each other in a first axis direction, a first end surface and a second end surface that are opposed to each other in a second axis direction orthogonal to the first axis direction, and a first side surface and a second side surface that are opposed to each other in a third axis direction orthogonal to the first axis direction and the second axis direction; 
 a plurality of terminals including at least a positive terminal, a negative terminal, and a temperature terminal that are arranged on the first end surface along the third axis direction; and 
 a cover having a plurality of terminal windows placed on the first end surface, configured to expose the terminals to outside, 
 wherein the plurality of terminals are arranged on the first end surface closer to the first side surface than the second side surface, and 
 wherein a center line of the first end surface that extends in the first axis direction, extends across the negative terminal. 
 
     
     
       13. The battery pack according to  claim 12 , wherein the plurality of terminal windows includes at least a first terminal window related to the positive terminal, a second terminal window related to the negative terminal, and a third terminal window related to the temperature terminal. 
     
     
       14. The battery pack according to  claim 13 , wherein, with respect to a center line of the first end surface that extends in the first axis direction, the positive terminal, the temperature terminal, and a portion of the negative terminal are located on a side of the center line closer to the first side surface. 
     
     
       15. The battery pack according to  claim 12 , wherein the positive terminal has an area larger than that of the temperature terminal. 
     
     
       16. The battery pack according to  claim 12 , wherein the negative terminal has an area larger than that of the temperature terminal. 
     
     
       17. The battery pack according to  claim 12 , wherein the one corner portion of the one terminal window positioned closest to the first side surface along the third axis has a larger radius of curvature than corner portions of each of the remaining plurality of terminal windows.